fn main() {
    println!("Hello, world!");
    another_function();
    test_function();
}

fn another_function() {
    println!("Hello, Rust!");
}

fn test_function() {
    let number = 3;
    if number < 5 {
        println!("条件为 true");
    } else {
        println!("条件为 false");
    }
}

